Machinery's Handbook, 31st Edition
2342 Involute Splines dimensions, reduced by the effective variation of the internal and external spline, is the maximum effective clearance. Where the effective variation obtained in machining is appreciably less than the variation allowance, these dimensions must be adjusted in order to maintain the desired fit. Maximum Effective Space Width and Minimum Effective Tooth Thickness: These dimensions define the maximum effective clearance but they do not limit the effective variation. They may be used, in addition to the maximum actual space width and minimum actual tooth thickness, to prevent the increase of maximum effective clearance due to reduction of effective variations. The notation “inspection optional” may be added where maximum effective clearance is an assembly requirement, but does not need absolute control. It will indicate, without necessarily adding inspection time and equipment, that the actual space width of the internal spline must be held below the maximum, or the actual tooth thickness of the external spline above the minimum, if machining methods result in less than the allowable variations. Where effective variation needs no control or is controlled by laboratory inspection, these limits may be substituted for maximum actual space width and minimum actual tooth thickness. Combinations of Involute Spline Types.— Flat root side fit internal splines may be used with fillet root external splines where the larger radius is desired on the external spline for control of stress concentrations. This combination of fits may also be permitted as a design option by specifying, for the minimum root diameter of the external, the value of the minimum root diameter of the fillet root external spline and noting this as “optional root.” A design option may also be permitted to provide either flat root internal or fillet root internal by specifying, for the maximum major diameter, the value of the maximum major diameter of the fillet root internal spline and noting this as “optional root.” Interchangeability.— Splines made to this standard may interchange with splines made to older standards. Exceptions are listed below. External Splines: These external splines will mate with older internal splines as follows: Year Major Dia. Fit Flat Root Side Fit Fillet Root Side Fit 1946 Yes No (A) a No (A) 1950 b Yes (B) Yes (B) Yes (C) 1950 c Yes (B) No (A) Yes (C) 1957 SAE Yes No (A) Yes (C) 1960 Yes No (A) Yes (C) a For exceptions A, B, C, see the paragraph on Exceptions that follows.
b Full dedendum. c Short dedendum. Internal Splines: These will mate with older external splines as follows: Year Major Dia. Fit
Flat Root Side Fit Fillet Root Side Fit
No (D) a Yes (F) Yes (G) Yes (G)
No (E)
No (D) Yes (C)
1946 1950
Yes Yes Yes
1957 SAE
Yes Yes
1960
a For exceptions C, D, E, F, G, see the paragraph on Exceptions that follows.
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